Verocious Motorsports Mild Steel O2 Sensor Bungs feature M18 x 1.5 Thread to accomodate all standard OEM and Wideband O2 Sensors. Our Standard Oxygen Sensor Bungs measure in at 1" diameter and 1/2" tall with flat faces on both sides. These high quality O2 bungs can be used on everything from custom downpipes to a quick repair on an OEM exhaust system. Available as single units and in sets of 5, 25, or 100. Buy in bulk and save!